 /*******************************************************************************
  * Copyright (c) 2000, 2006 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.core.internal.boot;

 import java.io.IOException ;
 import java.lang.reflect.Constructor ;
 import java.net.*;
 import java.util.Hashtable ;
 import org.eclipse.core.internal.runtime.CommonMessages;
 import org.eclipse.osgi.util.NLS;
 import org.osgi.service.url.AbstractURLStreamHandlerService;

 /**
  * URL handler for the "platform" protocol
  */
 public class PlatformURLHandler extends AbstractURLStreamHandlerService {

     private static Hashtable connectionType = new Hashtable ();

     // URL protocol designations
 public static final String PROTOCOL = "platform"; //$NON-NLS-1$
 public static final String FILE = "file"; //$NON-NLS-1$
 public static final String JAR = "jar"; //$NON-NLS-1$
 public static final String BUNDLE = "bundle"; //$NON-NLS-1$
 public static final String JAR_SEPARATOR = "!/"; //$NON-NLS-1$
 public static final String PROTOCOL_SEPARATOR = ":"; //$NON-NLS-1$

     /*
      * Constructor for the class.
      */
     public PlatformURLHandler() {
         super();
     }

     /* (non-Javadoc)
      * @see org.osgi.service.url.AbstractURLStreamHandlerService#openConnection(java.net.URL)
      */
     public URLConnection openConnection(URL url) throws IOException {
         // Note: openConnection() method is made public (rather than protected)
 // to enable request delegation from proxy handlers
 String spec = url.getFile().trim();
         if (spec.startsWith("/")) //$NON-NLS-1$
 spec = spec.substring(1);
         int ix = spec.indexOf("/"); //$NON-NLS-1$
 if (ix == -1)
             throw new MalformedURLException(NLS.bind(CommonMessages.url_invalidURL, url.toExternalForm()));

         String type = spec.substring(0, ix);
         Constructor construct = (Constructor ) connectionType.get(type);
         if (construct == null)
             throw new MalformedURLException(NLS.bind(CommonMessages.url_badVariant, type));

         PlatformURLConnection connection = null;
         try {
             connection = (PlatformURLConnection) construct.newInstance(new Object [] {url});
         } catch (Exception e) {
             throw new IOException (NLS.bind(CommonMessages.url_createConnection, e.getMessage()));
         }
         connection.setResolvedURL(connection.resolve());
         return connection;
     }

     public static void register(String type, Class connectionClass) {
         try {
             Constructor c = connectionClass.getConstructor(new Class [] {URL.class});
             connectionType.put(type, c);
         } catch (NoSuchMethodException e) {
             //don't register connection classes that don't conform to the spec
 }
     }
     
     public static void unregister(String type) {
         connectionType.remove(type);
     }
 }

